Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Lexus ES 300h BaseFACTORY OEM SERVICE PROCEDURE
Pre-Collision System (Hybrid) - Diagnostic Codes
- PRE-COLLISION SYSTEM (for HV Model)
- Vehicle Control History [06/2018 - 08/2020]
- Vehicle Control History [08/2020 - 08/2021]
- DTC C1425-71: Stop Light Relay Actuator Stuck [06/2018 - 08/2021]
- DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid Powertrain Control Module Missing Message [06/2018 - 08/2021]
- DTC U0235-87: Lost Communication with Cruise Control Front Distance Range Sensor Missing Message [06/2018 - 07/2019]
- DTC U0235-87: Lost Communication with Cruise Control Front Distance Range Sensor Missing Message [07/2019 - 08/2021]
- DTC U023A-87: Lost Communication with Image Processing Module "A" Missing Message [06/2018 - 08/2021]
- DTC U0300-51: Internal Control Module Software Incompatibility Not Programmed [06/2018 - 08/2020]
- DTC U0300-51: Internal Control Module Software Incompatibility Not Programmed [08/2020 - 08/2021]
- DTC U0300-57: Internal Control Module Software Incompatibility Invalid / Incompatible Software Component [06/2018 - 08/2020]
- DTC U0300-57: Internal Control Module Software Incompatibility Invalid / Incompatible Software Component [08/2020 - 08/2021]
- DTC U0418-81: Invalid Data Received from Brake System Control Module Invalid Serial Data Received [06/2018 - 08/2021]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.